Expansion-pulley.



No. 637,909. Patented Nov. 28; I899.

C. G. W. WERNICKE.

EXPANSIUNPULLEY. Application filad Mar. 13, 18995;

2 $heets-8haet I.

(No Model.)

No. 637,909. Patented Nov. 28, 1899.

C. G. W. WERNICKE.

EXPANSION PULLEY.

4 (Apphcacion filed Mar. 13, 1899.) 2 Sheet s'-Sheet 2.

gWd M NITED STATES PATENT. 101 FFICE.

oARLe. W. WERNIGKE, or MANKATO, MINNESOTA.

EXPANSION-PULLEY.

SPECIFICATION forming part of Letters Patent No. 637,909, dated November 28, 1899.

Application filed March 13, 1899. Serial No. 708,843. (No model.)

To all whom zit may concern:

Be it known that I, CARL G. W. WERNICKE, a citizen of the United States, residing at Mankato, in the county of Blue Earth and State of Minnesota, have invented certain new and useful Improvements in Expansion-Pulleys; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an expansion-pulley of simplified and improved construction; and to this end it consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

My improved pulley in its preferred form is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure 1 is an end elevation of the pulley, some parts being shown in section and others being removed and the expanded position of the pulley being indicated by dotted lines. Fig. 2 is a longitudinal section taken centrally through the pulley, some parts being shown in full and the expanded position of the pulley being indicated by dotted lines. Fig. 3 is a horizontal section taken on the line 00 m of Fig. 2. Fig. 4 is a detail in end elevation, showing the hub portion of the pulley proper, some parts being broken away; and Fig. 5 is a detail in side elevation, with some parts broken away, showing one of the rim-sections removed from working position.

The pulleyproper comprises a hub portion having radial slots or seats and a plurality of supplemental rim-sections having stem portions that work radially in the radial slots or seats of said hub portion. This hub portion (indicated by the numeral 1) is keyed or otherwise rigidly secured to the shaft 2, as indicated at 3. The hub portion 1 has a disk-like flange 4., in which a plurality of radial slots or seats 5 are formed. These slots or seats 5 have parallel guiding edges, and at their inner ends they are formed with narrow slots 6, that terminate Within the hub 1 in enlarged cylindrical perforations or passages 7. The supplemental rim-sections 8 are of segmental form, and they are provided with stem por tions 9, that closely fit within the corresponding radial seats or slots 5 of the hub-section. To hold these stem-sections in lateral positions, they are provided with edge flanges 10,

that embrace the adjacent sides of the disk portion 4. Inasmuch as the slots or seats 5 open at the periphery of adisk portion 4, these stem-sections 9 may be readily placed in working positions by slipping them endwise into the said seats. However, the flanges 10 might be separately constructed and either detachably or rigidly secured to the stems 9. At their inner ends the stems 9 are provided with transversely-extended slots 11, that stand in line with and are of approximately the same width as the adjacent slots 6 in the hub portion. These slots 11 terminate at their outer extremities in cylindrical perforations or passages 12, that are of approximately the same diameter as the perforations 7, heretofore noted; but these perforations 12, instead of extending parallel to the axis of the shaft 2, as in the case of the perforations 7, extend at an angle thereto, as best illustrated in Figs. 2 and 5. forations 12 extend at an angle of approximately thirty degrees to the axis of the shaft 2; but of course this angle may be varied as found desirable.

Mounted for sliding movements on the shaft 2 is a shipper-hub 13, which is provided with web-shaped cam-blades 14,.that extend radially from the said hub and project at their smaller end from one side, as shown from the left-hand side of the hub with respectto Fig. 2. The blades 14 are of such width that they work freely through the cooperating slots 6 and 11, heretofore noted. At theirinner edges the blades 14 are provided with cylindrical beads or enlargements 15, that extend parallel with the shaft 2 and work through the perforations 7 in the huh I, and at their outer edges the said wedge-shaped blades 14 are provided with beads or similar enlargements 16, that work through the perforations 12 of the stem portions 9 of the rim-sections 8.

To shift the shipper-hub 13 on the shaft 2 while the pulley is running, I have shown it as provided with a peripheral groove 17, in which an ordinary shipper-lever would work In the illustration given the said per- ICO given simultaneous and equal movements outward from the center of the pulley, and the pulley will thus be expanded. It is also evident that when the said shipper-hub and its cam-arms are forced toward the right with respect to Fig. 2 or away from the pulley the beads or enlargements 16, acting on the perforations 12, will draw the said rim-sections simultaneouslyinward with a positive action. It will be further noted that under these expanding and contracting actions of the wedgeshaped cam-arms on the rimsections the strains are not transferred to the shipper-hub 13, but are taken directly by the said camarms between the engaged portions of the beads or enlargements 15 and 16.

The above construct-ion, while extremely simple and of small cost, is durable, easily operated, and the parts of the pulley are always firmly held in their working positions.

To put the parts of the pulley together, it is only necessary to force the rim-sections to their extreme contracted positions and then to slip the smaller ends of the cam-blades 14 into operative positions by endwise movements thereof. Thus it will be seen that'no levers, springs, or other detachable parts, ex-

considerable modification as to detail within the scopeof my invention. For example, the beads 15 and 16, instead of being cylindrical, might be rectangular in cross-section or otherwise formed. Attention is also called to the fact that the engagements of the camwedges 14 with the hub and rim-sections of the pulleyproper cause the rotation of the sliding hub 13 with the shaft 2, and hence that no other provision need be made for securing the said hub 13 against rotation with respect to said shaft.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. In an expansion-pulley, the combination with a hub portion having radial slots or seats, of supplemental rim -sections having stem portions that work radially in said slots 01' seats, and a sliding hub or section, having wedge-shaped and beaded cam-blades that work in closely-fitting seats in the said hub portion and in the said stem portions, to positively expand and contract the pulley, substantially as described.

2. In an expansion-pulley, the combination with the hub portion having the radial slots or seats, of the supplemental rim-sections having the flanged stem portions that work radially in said slots or seats, and embrace the side portions thereof, and a sliding hub, provided with wed ge-shaped and beaded camblades that work in closely-fitting seats in the stem portions of said rim-sections, substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

CARL G. WV. VERNICKE.

Witnesses:

A. E. CLARK, A. E. HAwEs. 

